411 REFERENCE · Wiktionary
Nobert's lines
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
After F. A. Nobert, German manufacturer.
Noun
p Nobert's lines
Fine lines ruled on glass in a series of groups of different closeness of line, and used to test the power of a microscope.
en eponyms